81548384 has 48 divisors (see below), whose sum is σ = 166924800. Its totient is φ = 39187584.

The previous prime is 81548359. The next prime is 81548393. The reversal of 81548384 is 48384518.

It is a super-2 number, since 2×81548384² = 13300277866022912, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 88277 + ... + 89195.

It is an arithmetic number, because the mean of its divisors is an integer number (3477600).

Almost surely, 2^81548384 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 81548384, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (83462400).

81548384 is an abundant number, since it is smaller than the sum of its proper divisors (85376416).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

81548384 is a wasteful number, since it uses less digits than its factorization.

81548384 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1035 (or 1027 counting only the distinct ones).

The product of its digits is 122880, while the sum is 41.

The square root of 81548384 is about 9030.4143869481. The cubic root of 81548384 is about 433.6491037013.

The spelling of 81548384 in words is "eighty-one million, five hundred forty-eight thousand, three hundred eighty-four".